US6175204B1 - Dynamic brake for power door - Google Patents

Dynamic brake for power door Download PDF

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Publication number
US6175204B1
US6175204B1 US09/200,497 US20049798A US6175204B1 US 6175204 B1 US6175204 B1 US 6175204B1 US 20049798 A US20049798 A US 20049798A US 6175204 B1 US6175204 B1 US 6175204B1
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Prior art keywords
switch
motor
dynamic brake
voltage
control signal
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Expired - Lifetime
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US09/200,497
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English (en)
Inventor
Philip J. Calamatas
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Westinghouse Air Brake Co
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Westinghouse Air Brake Co
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Application filed by Westinghouse Air Brake Co filed Critical Westinghouse Air Brake Co
Priority to US09/200,497 priority Critical patent/US6175204B1/en
Assigned to WESTINGHOUSE AIR BRAKE CO. reassignment WESTINGHOUSE AIR BRAKE CO. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CALAMATAS, PHILIP J.
Priority to CA002282071A priority patent/CA2282071C/fr
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Publication of US6175204B1 publication Critical patent/US6175204B1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/03—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
    • H02P7/04—Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors by means of a H-bridge circuit

Definitions

  • the present invention relates, in general, to braking systems for power door systems and, more particularly, the instant invention relates to braking systems for transit vehicle door systems and/or elevator doors.
  • An electric motor for such a power door system may be powered by a pulse width modulated H-bridge amplifier.
  • the motor is a DC motor in which the magnetic field is provided by a permanent magnet.
  • the H-bridge amplifier switches a voltage and current from a pair of power supply lines to the electric motor and selects the polarity of the voltage applied to the motor in order to control the direction of the torque generated by the motor.
  • the H-bridge amplifier typically operates in one of four modes, which are referred to in the art as “quadrants”. These are:
  • a position encoder provides one or more position signal(s) which continuously indicates the position of the door(s).
  • the position information is conveyed to a logical device, which may be, for example, a CPU or a programmable logic chip.
  • This logical device generates a signal indicating the appropriate acceleration or deceleration of the door(s).
  • the signal typically is a pulse width modulated signal which is conveyed to the control inputs of the four switching devices of the H-bridge amplifier.
  • an obstruction detection indicator sends a signal to stop the doors. Stopping the doors may be done in a closed loop mode in which the logical device which controls the motor based on signals from the position encoder sends signals to decelerate the door(s).
  • Another difficulty is that oscillations may occur, the velocity of the door(s) overshooting zero speed and changing polarity. This requires a major intervention by the logical device to damp the resulting ringing of the loop dynamics as the speed decays to zero.
  • Another approach to the problem of absorbing the kinetic energy of the door(s) when an obstruction is detected is to short the motor through a shunt resistor so that the kinetic energy of the door(s) is absorbed as heat in the resistor. This is an open loop method which does not require functioning of the encoder or the logical device.
  • a further disadvantage of the shunt resistor approach is that as the motor ages, its magnetic field becomes weaker. The emf generated by an aged motor at any speed is therefore lower than when it was new. It, therefore, generates less current at any speed and the door is not decelerated as rapidly and the effect on a person in the path of the door is greater.
  • the invention is a dynamic brake for a power door which is moved by an electric motor.
  • the motor has at least a first motor terminal and a second motor terminal and is energized by a pulse width modulated H-bridge amplifier connected to a first power line having a first voltage and a second power line having a second voltage differing from the first voltage.
  • the H-bridge amplifier has a first switch connecting the first motor terminal to the first power line, a second switch connecting the second motor terminal to the first power line, a third switch connecting the first motor terminal to the second power line and a fourth switch connecting the second motor terminal to the second power line.
  • the dynamic brake has a brake control signal generator connected to receive an input signal indicative of a need to apply the dynamic brake.
  • the brake control signal generator having at least one output signal line having a signal connection to the control input of the first switch and to the control input of the second switch.
  • the brake control signal generator responds to the input signal indicative of a need to apply the dynamic brake by supplying at least one control signal to the control input of the first switch and to the control input of the second switch.
  • the control signal(s) cause the first switch to be closed and the second switch to be closed so that the motor is shorted through the first switch and the second switch, thereby allowing a braking current through the motor driven by an emf of the motor and hence dynamically braking the motor.
  • the invention is a method of braking a power door which is moved by an electric motor driven by an H-bridge amplifier having four switches connected to the motor.
  • the method consists of sending control signals to control terminals of two of the switches having electrical connection to each other and to terminals of the motor to provide a current return path to allow a braking current through the motor driven by an emf of the motor and hence dynamically braking the motor.
  • the invention is a dynamic brake for a power door which is moved by an electric motor having at least two terminals.
  • the motor is energized by a pulse width modulated door drive amplifier connected to a first power line and a second power line.
  • the door drive amplifier has a first group of switches connecting the motor terminals to the first power line and it has a second group of switches connecting the motor terminals to the second power line.
  • the dynamic brake has a brake control signal generator connected to receive an input signal indicative of a need to apply the dynamic brake and it has at least one output signal line connected to a control input of at least two of the switches in the first group of switches.
  • the brake control signal generator responds to the input signal indicative of a need to apply the dynamic brake by supplying at least one control signal to the control inputs of at least two switches in the first group of switches so that the control signal(s) cause at least two switches to conduct and provide at least one dynamic brake current circuit for a braking current driven by an emf of the motor and hence dynamically braking the motor.
  • Another object of the present invention is to provide an apparatus for stopping a power door which operates in an open loop mode and does not require a functioning logic device to process position or speed of the door.
  • Still another object of the present invention is to provide an apparatus for stopping a power door in substantially the shortest distance permitted by the door drive hardware.
  • Yet another object of the present invention is to provide an apparatus for stopping a power door which does not generate significant heat in a control cabinet for the door.
  • a further object of the present invention is to provide an apparatus for stopping a power door which does not tend to overshoot as the door is stopped.
  • Still yet another object of the present invention is to provide an apparatus for stopping a power door which limits the loads on the door drive hardware.
  • Yet still another object of the present invention is to provide an apparatus for stopping a power door in which the kinetic energy of the door is absorbed as heat in the motor windings.
  • a still further object of the present invention is to provide an apparatus for stopping a power door which does not feed electrical power back to the power distribution line which supplies power to the door.
  • An additional object of the present invention is to provide an apparatus for stopping a power door which does not generate a voltage spike on a power distribution line which supplies power to the door.
  • a further object of the present invention is to provide an apparatus for stopping a power door which prevents motion of the door after it has been stopped.
  • Yet another object of the present invention is to provide an apparatus for stopping a power door which provides the same door stopping current regardless of the age of the motor.
  • FIG. 1 is a mechanical schematic of a power door to which a presently preferred embodiment of the invention is applied;
  • FIG. 2 is an electrical schematic of a presently preferred embodiment of the dynamic brake of the invention in which a current feedback signal is obtained from a current sensor in series with the motor;
  • FIG. 3 is an electrical schematic of a presently preferred embodiment of the invention in which a current indicating signal is obtained from a current indicating terminal on a first transistor;
  • FIG. 4 is an electrical schematic of a presently preferred embodiment of the invention in which a current indicating signal is obtained from a current indicating terminal on a second transistor;
  • FIG. 5 is a plot of velocity versus time for a power door for a normal closing cycle and for an emergency stop with the dynamic brake of the invention.
  • FIG. 6 is an alternate embodiment of the present invention which provides dynamic braking for a power door having a brushless DC motor.
  • FIG. 1 Illustrated therein is a power door 20 which is opened and closed by a motor 76 .
  • Such motor 76 provides motive power through a transmission 79 connected to drive shaft 78 by a coupling 77 .
  • the drive shaft 78 is attached to a drive screw 80 through coupling 81 .
  • Such drive screw 80 engages a drive nut 82 that is connected to a door hanger 83 attached to door 20 .
  • Rotation of drive screw 80 causes the drive nut 82 to move along drive screw 80 and this moves such door hanger 83 and door 20 .
  • the present invention is a dynamic brake, generally designated 210 , for power door 20 .
  • the motor 76 has at least a first motor terminal 261 and a second motor terminal 262 .
  • the motor 76 is energized by a pulse width modulated H-bridge amplifier, generally designated 220 .
  • H-bridge amplifier 220 is connected to a first power line 201 having a first voltage and a second power line 202 having a second voltage, the second voltage differing from the first voltage.
  • the H-bridge amplifier 220 includes a first switch 221 which connects the first motor terminal 261 to the first power line 201 and it includes a second switch 222 connecting the second motor terminal 262 to the first power line 201 . It also has a third switch 223 connecting the first motor terminal 261 to the second power line 202 and a fourth switch 224 connecting the second motor terminal 262 to the second power line 202 .
  • first switch 221 has a first switch control terminal 231
  • second switch 222 has a second switch control terminal 232
  • third switch 223 has a third switch control terminal 233
  • fourth switch 224 has a fourth switch control terminal 234 .
  • Control inputs 231 , 232 , 233 and 234 have signal connections (not shown) to a motor control signal generator (not shown) for causing a torque in motor 76 in either direction to open or close door 20 .
  • the dynamic brake 210 has a brake control signal generator, generally designated 240 , which preferably is disposed within a complex programmable logical device, generally designated 250 .
  • Brake control signal generator 240 includes an input signal connection 246 for receiving an input signal indicative of a need to apply the dynamic brake 210 .
  • the brake control signal generator 240 has at least one output signal line 241 , or 242 , having a signal connection to a control terminal 231 of the first switch 221 and to a control terminal 232 of the second switch 222 .
  • the brake control signal generator 240 responds to the input signal indicative of a need to apply the dynamic brake 210 by supplying at least one control signal to the control input 231 of the first switch 221 and to the control input 232 of the second switch 222 .
  • the at least one control signal causes the first switch 221 to be closed and the second switch 222 to be closed so that the motor 76 is shorted through the first switch 221 and the second switch 222 , thereby allowing a braking current through the motor 76 driven by an emf of the motor 76 and hence dynamically braking the motor 76 .
  • the brake control signal applied on the signal line 241 to control input 231 of switch 221 and the brake control signal applied on signal line 242 to the control input 232 of switch 222 are pulses which are sequentially disposed in time. It is also preferred that the pulses be pulse width modulated to control a time averaged value of braking current through motor 76 .
  • dynamic brake 210 also have at least one first capacitor 271 connected in parallel to the first switch 221 and at least one second capacitor 272 connected in parallel to the second switch 222 in order to prevent undesirable voltage spikes due to interruption of the braking current through motor 76 . It is also preferred that at least one resistor 211 be placed in series with such first capacitor 271 , or at least one resistor 212 be placed in series with the second capacitor 272 , or both, to prevent current oscillations through first capacitor 271 , second capacitor 272 and motor 76 due to interruption of the braking current through motor 76 .
  • a current sensor such as sensor 236 , shown in FIG. 2, provides a current indicating signal on current feedback line 238 to the brake control signal generator 240 .
  • FIG. 3 shows an alternative configuration in which a current feedback signal is obtained on current signal line 251 from current indicating terminal 253 of switch 221 .
  • FIG. 4 shows another alternative configuration in which a current feedback signal is obtained on current signal line 252 from current indicating terminal 254 on switch 222 .
  • the current indicating signal from sensor 236 , current indicating terminal 253 or current indicating terminal 254 is used to determine a time averaged current through motor 76 and adjust the width of the pulses of the brake control signals to limit the time averaged current to a predetermined current value. It is preferred that switch 221 and switch 222 be closed whenever the time averaged braking current is below the predetermined current value.
  • the voltage of first power line 201 may be positive relative to the voltage of second power line 202 . Preferably, however, it is negative relative to the voltage of such second power line 202 .
  • switch 221 and switch 222 be voltage controlled, in which case the brake control signals applied to control input 231 of switch 221 and control input 232 of switch 222 are voltage signals.
  • these voltage signals are pulses which are sequentially disposed in time.
  • switch 221 and switch 222 are transistors and the brake control signals from brake signal generator 240 are transistor control signals.
  • switches 221 and 222 are field effect transistors and the signals are voltage signals.
  • switches 221 and 222 are metal oxide semiconductor field effect transistors and the brake control signals are voltage signals.
  • a current indicating signal is obtained from current indicating terminal 253 on metal oxide semiconductor field effect transistor 221 , or from current indicating terminal 254 on metal oxide semiconductor field effect transistor 222 .
  • control signal generator 240 sends signals to both the first switch 221 and second switch 222 to close them when door 20 has been closed to provide a force opposing opening of door 20 .
  • FIG. 5 is a plot of the velocity of door 20 during a normal opening or closing stroke and the velocity during an emergency stop provided by the dynamic brake of this invention.
  • the abscissa 281 indicates time and the ordinate 282 indicates the door speed.
  • the velocity, generally indicated as 280 during a normal stroke starts from zero velocity 284 and accelerates at a constant rate on acceleration ramp 286 . Upon reaching the maximum velocity 288 it remains at that velocity until it begins decelerating at a constant rate, following deceleration ramp 289 , until it reaches the zero speed 284 .
  • an obstruction detection system may send a signal for eddy current braking on signal line 246 .
  • the door 20 then decelerates rapidly following the dynamic braking curve, generally designated 290 , which includes linear portion 292 .
  • Linear portion 292 corresponds to the predetermined constant time averaged current through motor 76 .
  • motor 76 preferably is a DC motor having a permanent magnetic field.
  • the present invention provides a method of braking a power door 20 which is moved by an electric motor 76 driven by an H-bridge amplifier 220 .
  • H-bridge amplifier 220 includes four switches 221 , 222 , 223 and 224 which are connected to the motor 76 .
  • the method consists of communicating control signals to control terminals 231 and 232 of two of the switches 221 and 222 having electrical connection to each other and to the terminals 261 and 262 of the motor 76 to provide a current return path, generally designated 270 , to allow a braking current through the motor 76 driven by an emf of the motor 76 and hence dynamically braking such motor 76 .
  • Current return path 270 consists of first switch 221 , second switch 222 and motor 76 .
  • the method includes the step of generating the control signals as pulses sequentially disposed in time. The width of these pulses is, preferably, modulated to control a time average of the current through motor 76 and these pulses are modulated to limit the time average of the current through the motor 76 to a predetermined current value.
  • a motor having more than two terminals may be employed.
  • a brushless DC motor having three terminals may be employed using the circuit illustrated in FIG. 6 .
  • Electric motor 360 having terminals 361 , 362 and 363 , is powered by door drive amplifier 320 .
  • Door drive amplifier 320 has a first group of switches 380 consisting of switches 321 , 322 and 323 which connect the motor terminals 361 , 362 and 363 to a first power line 201 having a first voltage.
  • Amplifier 320 also, has a second group of switches 390 consisting of switches 324 , 325 and 326 which connect motor terminals 361 , 362 and 363 to a second power line 202 having a second voltage.
  • first switch 321 includes first switch control terminal 331
  • second switch 322 includes second switch control terminal 332
  • third switch 323 includes third switch control terminal 333
  • fourth switch 324 includes fourth switch control terminal 334
  • fifth switch 325 includes fifth switch control terminal 335
  • sixth switch 326 includes sixth switch control terminal 336 .
  • Control terminals 231 , 232 , 233 , 234 , 325 and 326 have signal connections (not shown) to a motor control signal generator (not shown) for causing a torque in motor 360 in either direction to open or close door 20 .
  • Dynamic brake 310 has a brake control signal generator, generally designated 340 , which preferably is disposed within a complex programmable logical device, generally designated 350 .
  • the brake control signal generator 340 includes an input signal connection 346 for receiving an input signal that is indicative of a need to apply the dynamic brake 310 .
  • the brake control signal generator 340 has at least one output signal line, preferably, output signal lines 341 , 342 and 343 having a signal connection to control terminal 331 of the first switch 321 , control terminal 332 of the second switch 322 and control terminal 333 of the third switch 323 .
  • the brake control signal generator 340 responds to the input signal on line 346 by supplying at least one control signal to at least two of the control terminals 331 , 332 and 333 .
  • brake control signals are supplied on lines 341 , 342 and 343 to control inputs 331 , 332 or 333 .
  • Control signals applied to two or more control terminals 331 , 332 and 333 cause two or more of the switches 321 , 322 and 323 to conduct and provide at least one dynamic brake current return circuit for at least one dynamic braking current driven by an emf of motor 360 and hence damping motor 360 .
  • control signals are applied to all three control terminals 331 , 332 and 333 to provide three braking currents between terminals 361 , 362 and 363 .
  • a capacitor 371 and resistor 311 be placed in parallel with switch 321 .
  • a capacitor 372 and resistor 312 be placed in parallel with the switch 322 and that capacitor 373 and resistor 313 be placed in parallel with the switch 323 .
  • the control signals applied to terminals 331 , 332 and/or 333 be pulse width modulated to limit an average value of the braking current through motor 360 .
US09/200,497 1998-11-25 1998-11-25 Dynamic brake for power door Expired - Lifetime US6175204B1 (en)

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US09/200,497 US6175204B1 (en) 1998-11-25 1998-11-25 Dynamic brake for power door
CA002282071A CA2282071C (fr) 1998-11-25 1999-09-10 Frein dynamique pour porte electrique

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Cited By (33)

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US20040118638A1 (en) * 2002-12-23 2004-06-24 Delaporte Dany Paul Electric motor with dynamic damping
US20040182234A1 (en) * 2002-12-20 2004-09-23 Dorma Gmbh + Co. Kg Electrohydraulic servo door drive for operating a door, a window, etc.
US6847178B2 (en) * 2001-09-27 2005-01-25 The Chamberlain Group, Inc. Method and apparatus for dynamic braking of a barrier operator
EP1562089A2 (fr) * 2004-02-04 2005-08-10 GfA - Gesellschaft für Antriebstechnik Dr.-Ing. Hammann GmbH & Co. KG Dispositif et méthode pour la commande de déplacement horizontal ou vertical d'une charge
US20050174081A1 (en) * 2004-02-06 2005-08-11 That Nguyen Multi-stage dynamic braking resistor network
US20050184692A1 (en) * 2004-02-25 2005-08-25 Delta Electronics, Inc. Instantaneous fan stopping method and structure thereof
US20050273195A1 (en) * 2004-06-08 2005-12-08 Lockheed Martin Corporation Controller for movable systems
US7033127B2 (en) * 2001-04-27 2006-04-25 Vantage Mobility International, Llc Powered, folding ramp for minivan
US20060132073A1 (en) * 2004-12-21 2006-06-22 Vacon Oyj Braking chopper
US20070145923A1 (en) * 2005-12-23 2007-06-28 Delta Electronics, Inc. Fan system and real-time stopping device thereof
US20070216327A1 (en) * 2006-03-16 2007-09-20 Nissan Motor Co., Ltd. Vehicle drive control system, motor control device and a method for drive control of a vehicle
US20070241701A1 (en) * 2006-03-24 2007-10-18 Sanyo Electric Co., Ltd. Motor Drive Circuit
US20080047784A1 (en) * 2006-08-28 2008-02-28 Siemens Aktiengesellschaft Door operating mechanism for an automatic door
US20080047200A1 (en) * 2006-08-28 2008-02-28 Siemens Aktiengesellschaft Door drive for an automatic door
US20090140094A1 (en) * 2006-06-23 2009-06-04 Benninger Ag Yarn-Tensioning Device and Arrangement and Method for Operating a Creel
US20090217596A1 (en) * 2005-12-21 2009-09-03 Robert Neundorf Method and device for controlling the closing movement of a chassis component for vehicles
US20090261746A1 (en) * 2007-07-31 2009-10-22 Lsi Industries, Inc. Control of light intensity using pulses of a fixed duration and frequency
US20090267544A1 (en) * 2008-04-23 2009-10-29 Ching-Tsan Lee Motor control circuit and operation method thereof
US20100219783A1 (en) * 2009-02-27 2010-09-02 Sanyo Electric Co., Ltd. Motor drive circuit
US20110106350A1 (en) * 2009-10-30 2011-05-05 Lsi Industries, Inc. Traction system for electrically powered vehicles
US20120013278A1 (en) * 2010-07-13 2012-01-19 Honeywell International Inc. Resistorless dynamic motor braking system and method
US8604709B2 (en) 2007-07-31 2013-12-10 Lsi Industries, Inc. Methods and systems for controlling electrical power to DC loads
US9650824B2 (en) 2013-10-01 2017-05-16 Warren Industries Ltd. Vehicle door control system
US20180313128A1 (en) * 2017-02-08 2018-11-01 Geze Gmbh Braking device
US20180313129A1 (en) * 2017-02-08 2018-11-01 Geze Gmbh Braking mechanism
US20190242172A1 (en) * 2018-01-22 2019-08-08 Geze Gmbh Braking device for a movable door leaf and a door closer having such a braking device
US10415286B1 (en) 2016-09-20 2019-09-17 Apple Inc. Hinge with feedback
EP3245728B1 (fr) 2015-01-13 2019-09-25 GEZE GmbH Dispositif de freinage d'un battant de porte mobile et dispositif de fermeture de porte correspondant
US20200247380A1 (en) * 2015-12-09 2020-08-06 Robert Bosch Gmbh Method for Operating a Braking Mechanism, Control Device for a Braking Mechanism of Said Type, Braking Mechanism, and Vehicle Comprising a Braking Mechanism of Said Type
CN113039146A (zh) * 2018-11-26 2021-06-25 三菱电机株式会社 电梯的门控制装置
US11199039B2 (en) * 2017-08-22 2021-12-14 Edscha Engineering Gmbh Drive device for a vehicle flap
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Cited By (56)

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Publication number Priority date Publication date Assignee Title
US7033127B2 (en) * 2001-04-27 2006-04-25 Vantage Mobility International, Llc Powered, folding ramp for minivan
US6847178B2 (en) * 2001-09-27 2005-01-25 The Chamberlain Group, Inc. Method and apparatus for dynamic braking of a barrier operator
US6930458B2 (en) * 2001-12-20 2005-08-16 Brother Kogyo Kabushiki Kaisha Apparatus for controlling deceleration of DC motor
US20030151380A1 (en) * 2001-12-20 2003-08-14 Brother Kogyo Kabushiki Kaisha Apparatus for controlling deceleration of DC motor
US20040182234A1 (en) * 2002-12-20 2004-09-23 Dorma Gmbh + Co. Kg Electrohydraulic servo door drive for operating a door, a window, etc.
US6978609B2 (en) * 2002-12-20 2005-12-27 Dorma Gmbh + Co. Kg Electrohydraulic servo door drive for operating a door, a window, etc.
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EP1562089A2 (fr) * 2004-02-04 2005-08-10 GfA - Gesellschaft für Antriebstechnik Dr.-Ing. Hammann GmbH & Co. KG Dispositif et méthode pour la commande de déplacement horizontal ou vertical d'une charge
EP1562089A3 (fr) * 2004-02-04 2007-04-11 GfA - Gesellschaft für Antriebstechnik Dr.-Ing. Hammann GmbH & Co. KG Dispositif et méthode pour la commande de déplacement horizontal ou vertical d'une charge
US20050174081A1 (en) * 2004-02-06 2005-08-11 That Nguyen Multi-stage dynamic braking resistor network
US7012392B2 (en) 2004-02-06 2006-03-14 Honeywell International Inc. Multi-stage dynamic braking resistor network
US20050184692A1 (en) * 2004-02-25 2005-08-25 Delta Electronics, Inc. Instantaneous fan stopping method and structure thereof
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